Improvement in glass-presses



A.. P'. BROGKE. mass-Presses.'

N0. 128,280, Patented June 25,1872.

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UNITED STATES PATENT OEErcE.

ARIES P. BROOKE, OF NEW YORK, N. Y., ASSIGNOR TO IVILLIAM BROOK- FIELD, OF SAME PLACE.

IMPROVEMENT EN GLASS-PRESSES.

Specification forming part of Letters Patent No. 128,280, dated June 25,1872.

To all whom it may concern:

Be it known thatI, ARIES P. BROOKE, ofthe city, county, and State of New York, have invented a new and useful Improvement in Glass-Presses and I do hereby declare the following to be a full, clear, and exact description thereof, which will enable tho'se skilled in the art to make and use the same, reference being had to the accompanying drawing forming part of this specification, in which drawing- Figure 1 represents a front view of this invention. Fig. 2 is a transverse section of the same. Fig. 3 is a similar view of a modification thereof'.

Similar letters indicate corresponding parts.

This invention relates to a press which is intended particularly for the manufacture of glass screw-insulators or other articles of a similar nature, and in which a plunger is used, which is provided with a sleeve, and which works through a follower, the latter-being depressed on the top of the mold to prevent the molten glass from overflowing when the plunger is depressed to form the socket, while the sleeve of the plunger forms the outer enlarged cavity in the insulator. My present improvement consists in combining with the cross-head that carries the follower, with or without the sleeve, and with the mechanism used for depressing the plunger and the follower together, a lifter, which acts on the follower in such a manner that said follower can be raised from contact with the glass in the mold immediately after the glass has set and before the plunger is withdrawn from the glass, and thereby the fshrending of the glass from contact with the follower is prevented. My invention 'consists further in combining with the sleeve an automatic lifting mechanism in such a manner that, as soon as the plunger has reached the end of its down stroke, the sleeve is immediately withdrawn from contact with the glass, and the danger of shrending is materially reduced or entirely avoided.

In the drawing, the letter A designates a frame, through the upper part of which extends a' rod, B, which is firmly connected to a gate, O, composed of cross-bars a a and uprights b b. This gate slides freely up and down between suitable guides d in the frame A, and it is raised or depressed by a lever, D, which has its fulcrum on a pivot, c, secured in the upper ends of link-braces E, and to which is secured an arm carrying a weight, F, which serves as a balance-weight against the moving parts of my press during the operation. Through the gate C extends the spindle Gr, the lower end of which forms the plunger, while its upper end is guided in a hole bored in an axial direction into the rod B. (See Fig. 2.) Said spindle is provided with a screw-thread, d', the pitch of which corresponds to that of the thread of the plunger, and which screws into a bridge, e, that is rigidly connected to or forms a part of the gate C. On the spindle is mounted a bevel-pinion, f, fastened thereto by afeather-key, and meshing ina bevel-wheel, l

g, mounted on an arbor,l1., which has its bearings in a bracket attached to the gate C, and can be turned by means of a hand-crank, z'. By revolving this arbor, therefore, the spindle Gr rises or falls independent of the gate O. Through the cross-bars of the gate C extend two upright rods, 7', the upper ends of which are connected by a traverse, 7c, while their lower ends are fastened to a cross-head, Z, that carries the follower H. On the rods 7' are wound springs m, the lower ends of which bear on pins extending through said rods, while their upper ends bear against the upper crossbar of the gate C, so that, when the gate, together with the plunger, is depressed by means of the lever D, the follower, on striking the top of the mold M, is retained there by the pressure of the gate on the springs m. On the upper cross-bar of the gate O is mounted a knuckle lever, I, which, when being depressed, acts against the traverse lc, that connects by rods j with the cross-head l,carryi1`1g the follower H, so that, when the plunger has been depressed into the mold, the follower can be lifted sufficiently to clear the glass before the plunger is withdrawn. If the follower is allowed to remain in contact with the glass until the plunger is withdrawn, the glass, being in contact at its top edge with the follower, is liable to crack or to shrend.7 By raising the follower in advance of the plunger the glass is cooled from the inside out, and the danger of shrending is materially reduced. On the plunger or its spindle is tted a sleeve, J, which serves to produce the enlarged portion of the cavity in the open end of the insulator. This sleeve may either be secured to or made solid with the follower, as shown in Fig. 3; and in this case both those parts are raised free from contact with the glass in advance of the plunger by the action of the knuckle-lever I, so as to prevent shrending. The sleeve J may, however, be arranged as shown in Figs.

l andv2, where it is independent of the follower, and also of the plunger, being provided with a head, m, which connects, by springs n, with the top cross-bar of the gate (J. On this head are also secured toggle-levers o, which are connected by pivots p, and from one of which extends an arm, q, from which is suspended a forked lever, r, that catches over a pin, s, pro'- jectin g from the crosshead of the follower.

If the plunger is raised to the upper end of its stroke, the toggle-levers o are straightened out, so that the sleeve is depressed and retained in the position which it has to occupy in order to produce the required cavity in the glass when it is depressed, together with the plunger; but as soon as the plunger has been depressed to the lower end of its stroke, the lever fr, by its action against the pin s, throws the toggle-levers out of their upright position, and the springs n cause the sleeve to rise in l. The combination, with the cross-*head that carries the follower, with or without the sleeve, and with the mechanism for depressing the plunger, of a lifter, which acts on the follower and raises the same clear of the glass in the mold before the plunger is withdrawn from the glass, substantially as and for the purpose described.

2. The follower and sleeve connected together, substantially as shown in Ifig. 3.

3. The mechanism, substantially as described, for withdrawing the sleeve automatically in advance of the plunger, as set forth.

This specification signed by Ine this 10th day of May, 1872.

ARIES P. BROOKE. Witnesses:

W. HAUFF, E. F. KAsTnNHUBnR. 

